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Restructuring and Business Realignment (Schedule of Business Realignment Charges Classified by Statement of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | $ 710 | $ 1,812 | $ 2,617
Cost of Goods Sold [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | 63 | 426 | 437
Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | 491 | 1,385 | 1,080
Design and Development Expense [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | 156 | 1 | 1,100
Control Devices [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | 169 |  |
Control Devices [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 41 |
Control Devices [Member] | Design and Development Expense [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 128 |  |
Electronics [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | 63 | 1,223 | 1,180
Electronics [Member] | Cost of Goods Sold [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 56 |
Electronics [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 63 | 1,167 | 196
Electronics [Member] | Design and Development Expense [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  |  | 984
PST Segment [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total business realignment costs (benefit) | 478 | 589 | 1,437
PST Segment [Member] | Cost of Goods Sold [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 63 | 370 | 437
PST Segment [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 386 | 218 | 884
PST Segment [Member] | Design and Development Expense [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | $ 29 | $ 1 | $ 116

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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